Island



(No Model.)

B. ARNOLD. INSTRUMENT POR MARKING.

Patented Apr. 2.2,` 1890 l NVENTCIR.

WITN EEEEE.

we News paens col., muro-uma, msumamu, nA c.

UNTTED STATES BENJAMIN ARNOLD, OE EAST PATENT OFFICE.

GREEN\VICII, RHODE ISLAND.

lNSTRUlVlENT FOR MARKING.

SPECIFICATION forming part of Letters Patent No. 426,094, dated Aprl22, 1890.

Application filed February 1 9, l 8 90.

T0 all whom t may concern:

Be it known that I, BENJAMIN ARNOLD, of East Greenwich, in the county of Kent and State of Rhode Island, have invented certain new and useful Improvements in Automatic Instruments for Marking, doc.; and I do hereby declare that the following is a full, clear, and exactdescription thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

The object'of this invention is to produce an instrument to be used mainly in pricking dots in a circular arrangement, as in setting' out holesto be drilled, or for marking divisions of spaces in other forms and for making other marks or indentations-as, for instance, ligures or letters, &c. It isillustrated in the accompanyin g drawings, in which- Figure l is an elevation of the marking de vice held in the hand as when used in mak ing separate marks. Fig. 2 shows an enlarged vertical section taken through the center of the instrument. Fig. is an elevation 'showing the combination of the marking device and one leg of a pair of dividers, as used in pricking out circles and in dividing lines into equal divisions. Fig. at shows a part of the same as Fig. 2 with the addition of a spring and case, as hereinafter explained. Eig. 5 shows a modification of the parts shown in Fig. 4.

In the drawings, A represents a tubular case having a plug in its lower end made tapering on the out-side of the case. An opening is made lengthwise through the center of this plug to receive a marking-tool d, eonstructed to make a pointed or other impression, as may be desired. The marking-tool is held in place in the opening in the plug by means of a small screw c, which screws in through the side of the plug and enters a re cess made in one side of the tool d. This recess in the tool, into which the screw enters, is made large enough to allow the tool to move up or down a short distance. Another tubular case C is made of the proper size to just slide easily in the case A, and has a ring s inserted in its top to raise it by. A hammer D is made with a larger portion of the proper size to slide freely in the; ease C and a smaller Serial No. 341,052. (No model.)

portion or handle extending from the larger portion or weight up into the case O. An open spiral spring a, made just large enough to work freely in the case C, is placed around the smaller portion of t-he hammer, and, extending some distance above the upper end of the hammer, has its upper end attached to the top of the case O, while the lower end of the spring is fastened to the middle of the hammer D, so that when the case O is drawn u p out of the case A the hammer D will also be drawn up vby the spring a.

A projection c is placed on one side of the case A in its lower part on the inside, and is put at the height above the plug that it is desired to raise the hammer D in using it. The hammer D has a light spring Z) fastened on its side opposite to the projection c, for the purpose of throwing the lower end of the hammer, when it is raised, over to the other side of the ease A, that the lower end of the hammer may catch on the upper end of the proj ection c and be held there until dislodged in using.

The spring h maybe dispensed with and the hammer thrown over by bending the spring d so that it will touch the side of the tube O oppositie to the projection, as it will require butI a very light pressure to swing the hammer over as desired.

In Fig. EL a forni of the instrument-is shown in section in which the ring s (shown in Fig. 2) is dispensed with and the case C, with spring a and hammer D, raised after having made a stroke by means of an open spiral spring a', placed around the upper part of the case O and having its lower end resting on the upper end of the case Aand its upper end pressing against the ring e', attached to the case O. c is a short case attached to the up end of case A to protect the spring a by sliding over it. This spring c should not be made any stronger than what is necessary to raise the parts described,because the force required to compress it mustbe subtracted from the force used to compress the spring a in making a stroke.

Fig. 5 shows the case c made longer than it is inv Fig. fi and attached to the top of the case O, so as to move with that case and slide freely over the case A below. The spring is IOO also carried up to press against the top of the case C, though the projection may still be used, as in Fig. 4.

' in it carried off to one side and curved for the purpose of allowing the dividers leg-point to be extended off to enlarge the circle, and at the same time have the marker-leg retain a position nearly vertical to the plane to be marked. A block s', having a vertical hole in it to receive the case A of the marker and hold it rmly, has also a projecting ridgeo on its side itting into the curved slot in the top Y of the divider-leg, and a pin f,projecting out from the middle of this ridge, has a screwthread cut on it, and a milled nut f is fitted on it to be screwed up and hold the dividerleg fast to the block s when set.

In using the marking leg or device without the divider-leg it is held in the fingers with the forefinger through the ring, as shown in Fig.Y l. The case C is drawn up partly out of the case A by raising the foreinger and ring s. This draws up the hammer by means of the spring a, which, as before stated, is connected at its ends to the hammer and case C until the lower end of the hammer D is above the upper end of the projection c, upon which it will lodge, being pushed over that way by the spring b on its other side. The work to be marked being held by the other hand, the point of the marker CZ can be put at the exact place where the mark is wanted, and by pressing down on the top of case C with the forefinger in the ring s the case C will be pressed down into the case A,

compressing the spring a on the top of the hammer D until the lower edge of the case C, passingdown at the side of the hammer, crowds the lower end of it olf of the proj ection c, that holds it, when the compressed spring a will throw it down forciblyT against the upper end of the marker d, forcing its lower end into the material below, making the desired mark.

In using the instrument with the dividerleg to mark out ycircles or divide lines off into spaces it is Vheld in the hand and operated in the same manner as just described, except that the point of the divider-leg B is placed in a mark first made for the center of the circle, and as the successive marks of the circle are made the instrument is swung around on the point of the divider-leg, so that the marks made will be concentric, and in dividing aline into spaces the point of the dividerleg is placed successively in the last mark made to govern it in making the next, so that the spaces between the marks will be equal.

This instrument can also be used for other purposes besides that of a marker.

lSy making' the lower endof the tool cl flat and sharp it may be used to cut with, and by rounding the point it may be usedas a dental plugger or for driving small tacks or points without any other alteration of its working parts.

Having thus described my improvements, what I claimas my invention isl. The combination of an automatic percussive marking-instrument with a leg of a pair of dividers, substantially as and for the purpose setforth.

2. he combination7 with va hammer and a spring arranged substantially as described, of an interior and an exterior case, the latter being provided with a projection to receive and support the hammer when raised and having a tool at its lower end, substantially.

as described.

3. The combination 0f the case C and the case A, having a plug in its lower end with an axial aperture in it to receive a tool, a hammer with a spring to operate it, and a tool, substantially as;V described.

4t. The combination of the case C and of the case A, having the projection c and the tool d, the hammer D, provided with the spring a and the spring l), with the case c and the spring a', substantially as and for the purpose set fort-h.

BENJ. ARNOLD.

WVitnesses:

H. A. SHovE, M. C. ARNOLD. 

